This article outlines the Consensus Value (CV) protocol, a global mass measurement standard established after the 2019 redefinition of the kilogram using a fixed quantum constant known as the Planck constant. Developed by NIST in collaboration with National Measurement Institutes worldwide and overseen by the Consultative Committee for Mass (CCM), the protocol ensures all labs use a unified, mathematically precise baseline rather than a physical artifact. The standard has been officially implemented since 2019 but remains under active review, with periodic updates issued as international experiments refine their measurement techniques using Kibble balances or silicon spheres.
While primarily focused on precision metrology rather than quantum computing directly, this framework supports advanced scientific research and high-tech manufacturing by establishing a reliable measurement foundation that emerging quantum technologies will depend upon. All calibration laboratories must factor the CV and its uncertainty into their certificates to maintain traceable, globally consistent results. A new international comparison report is expected later this year to adjust the CV, and full transition to independent lab measurements is planned once the CCM confirms sufficient global agreement has been achieved.
NIST addresses these requirements through biennial training courses that teach professionals how to correctly apply and track the CV across calibration networks. Because measurement techniques continue to improve, the standard will evolve until independent realizations can be universally trusted. Until then, laboratories must monitor periodic updates to ensure accurate traceability, keeping precision standards aligned with advancing scientific and industrial needs.
Keywords: mass metrology, Kibble Balance, SI kilogram
